Help Me Pick Some Heads For Christmas Present

[Nuckingfuts]

So with Christmas just around the corner I wanted to use the opportunity to pick up some heads for my son's '73 project truck as a surprise. He's been working hard to pay for parts on his own to this point so a little bit of help from Dad isn't a bad thing this time.

The engine is the original rebuilt sbc 350 5.7L with the following mods:

- Comp Cams Xtreme Energy Cam & Lifter Kit (11/2010): Summit# CCA-K12-238-2; Cam/Lifter, Valvetrain(timing chain, sprockets, springs, valve stem seals, etc.), Hydraulic Flat Tappet, Advertised Duration 262int/270exh (Actual duration at 050” lift: 218/224), Lift .462int/.469exh. (Stock 350 SBC Cam Spec-estimated: dur @ .050 on that cam is 195/202)

- 1406 EB carb & Performer EPS manifold

- Full length headers, 2.25" exhaust with flowmaster mufflers

- 3.08 gearing

Basically I'm looking to increase low end torque and bump the hp a bit so I'd like to replace the stock heads with something but I just don't know what all of my options are so I'd like to get some direction from you guys. With a budget approach in mind, should I get...

1. Rebuild 062 Vortec heads on ebay (~$175/head but I have to send back cores which I don't have so I'm not sure what the extra cost will be here)
2. Summit Vortec heads like this: https://www.summitracing.com/parts/sum-151124
3. Corvette Heads (which are best?)
4. Another option?

Ideally I'd like to utilize the components we currently have.